EP2887763A1 - Procédé, appareil et produit de programme informatique pour commander une source de chaleur associée à de l'inertie thermique - Google Patents

Procédé, appareil et produit de programme informatique pour commander une source de chaleur associée à de l'inertie thermique Download PDF

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Publication number
EP2887763A1
EP2887763A1 EP13198275.3A EP13198275A EP2887763A1 EP 2887763 A1 EP2887763 A1 EP 2887763A1 EP 13198275 A EP13198275 A EP 13198275A EP 2887763 A1 EP2887763 A1 EP 2887763A1
Authority
EP
European Patent Office
Prior art keywords
heat source
power level
power
transition phase
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13198275.3A
Other languages
German (de)
English (en)
Inventor
Bogumil Tulin
Martin Kessler
Bryan Thomas Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Appliances AB
Original Assignee
Electrolux Appliances AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux Appliances AB filed Critical Electrolux Appliances AB
Priority to EP13198275.3A priority Critical patent/EP2887763A1/fr
Publication of EP2887763A1 publication Critical patent/EP2887763A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0263—Ovens

Definitions

  • radiant heat sources are used in kitchen hobs or ovens.
  • Such radiant heat sources are usually made out of metal with a distinct mass, and when they are heated, they demonstrate a heat inertia in a form that they need a certain time to adapt to a certain temperature once a certain electric power level is applied, and on the other hand when the electric power is switched off, they still stay warm for a longer time depending on their mass and their respective temperature.
  • the thermal properties of the heater add up to the ones of the housing and the food to be prepared to form a system heat transmission inertia.
  • the power level that is adjusted by a user or operator who is in the process of preparing a food dish should reflect in a temperature change in the heat source timely and correctly in terms of increase or decrease of the temperature of the heated food.
  • document EP 0442139 A2 discusses a method and an apparatus for control of the power that is supplied to at least one load.
  • a principle is to cut half waves of a symmetrical oscillation packet control, while at the same time satisfying a requirement regarding the switch-off times and a DIN standard. No other related prior art is known.
  • the invention is based on the problem to provide a better power control for a heat source that in particular helps saving energy.
  • a method according to the present invention contemplates for a transition phase between two power levels in which the heat source is operated differently than at the initial power level and at the desired final power level.
  • a transition phase allows for an adaptation of the power control to compensate for heat inertia of the heat source and a total thermal system of masses associated to a heating process involved in terms avoiding a temperature overshooting as much as possible.
  • the initialization of a transition phase is triggered by the setting of a lower power level.
  • the heat source is operated at no or a lower second power level in order to adapt to the heat inertia, which provides additional thermal energy in the heating process and can thus be exploited to save energy.
  • this leads to a better correspondence of the power control curve and the temperature control curve.
  • the heat source in the transition phase is lesser switched on and longer switched off than at the initial power level and at the power level to be achieved in order to operate it at a lower power level.
  • the beginning of the transition phase there is a time period where no power is supplied to the heat source in order to control it and to take care of the compensation of the heat inertia and to use the thermal energy amount present in the thermal system including the heat source and e.g. the other heated masses like food and oven cavity to arrive at the final power level to be established according to a control signal.
  • pulse-width modulation is used to control switching on and off of the heat source.
  • Such technology is known in the art and thus components are available to perform power control in an adequate and reliable manner suitable for consumer applications.
  • the duty cycle of a pulse-width modulation changes in the transition phase in order to compensate for the thermal inertia of the thermal system including the heat source and e.g. the other heated masses like food and oven cavity.
  • the duty cycle of the pulse-width modulation changes in a dynamic manner to better be able to closely control a temperature curve to follow a power control curve towards a value to be achieved as a final power and temperature level.
  • the start of the transition phase is controlled in dependency of a control signal issued to set a first lower power level. This, because this is the first point in time when the system knows that it should adapt to a different power level and thus the transition phase can optimally be used. It also allows a precise control to arrive at the final power level.
  • the adaptation from one power level to the next power level is controlled in dependency of the heat inertia of the thermal system including the heat source and e.g. the other headed masses like food and oven cavity.
  • This allows for a good adaptation of the temperature curve that the heat source follows from the temperature associated to the initial power level to the temperature associated to the final power level.
  • the heat source is controlled to avoid temperature overshooting or non achieving, when a different power level is selected by adaptively controlling the power to the heat source in the transition phase.
  • the heat source is controlled to follow a temperature curve as closely as possible. This can be done by taking the heat inertia of the thermal system including the heat source and e.g. the other heated masses like food and oven cavity into account to a maximum degree and dimensioning the power to be supplied to the thermal system of heated masses adaptively and optimally for a given system heat inertia.
  • the apparatus or kitchen hob according to the present invention comprises a minimum number of components to execute the method according to the present invention.
  • a technically relatively simple device can be presented that is attractive for the customer as it features the benefits such as better user experience and power saving provided by the instant invention.
  • the apparatus or kitchen hob comprises a reader for a storage medium, because in this manner the instructions how the heat source can be controlled in the transition phase and a behavior in the initial power level and the final power level can be changed or serviced.
  • individual heat sources e.g. plural heating elements allocated to different heating zones of a glass ceramic hob to their individual heat inertia, especially once such a radiant heat source had to be replaced due to service.
  • a computer program product comprises a storage medium and instructions to carry out the method steps as process steps, once these instructions are read and executed by a computing device.
  • the power control of the heat source can always be adapted to the latest state of the art research results in terms of actual and desired heat behavior of the heat source, e.g. in a kitchen environment.
  • the corresponding pulse-width modulated power 112 basically shows a power curve 120 at full load. This leads to a temperature curve 110 with a maximum gradient depending on the heat inertia of the heat source.
  • a heat source can be, for example, a heater of a glass ceramic kitchen hob in a particular heating zone or the heater of an oven.
  • the time t is indicated.
  • the maximum or higher power level is indicated by 145, and the first lower power level is indicated with reference numeral 150.
  • the pulse-width modulated power contains valleys 130 and peaks 125. A peak may have a width of 135 and a valley may have a width of 140. Not necessarily, those dimensions have to be the same.
  • a transition from a high power level to a lower power level can directly lead to an overshooting of a temperature curve until the final temperature 180 is achieved that corresponds to the first lower power level.
  • This overshooting is indicated by reference sign 170, and the area under the curve corresponds to the energy that is consumed due to the overshooting.
  • a control of a kitchen hob is performed by an electronic embedded system.
  • power is set initially to a maximum or to a high power level for heating e.g. the food fast, and after reaching a certain temperature, the power level is set to a lower one.
  • this is managed by observation by an operator being in front of the cooking hob adjusting the power control of the heating zone correspondingly.
  • Such a control leads to a waste of energy as a consequence of the heat inertia of the heating device, e.g. a radiant heater.
  • control of power levels and associated temperature of a heating device can be performed differently, if the present invention is applied here in a preferred embodiment as an example.
  • a temperature curve 210 is indicated corresponding to an initial higher power level 245, a transition phase 255 and a first lower power level 250.
  • the overshooting in the temperature curve 290 is much smaller than the one in Fig. 1 . This is achieved by controlling the power supplied to the heat source in a transition phase 255, differently then as under the power control that is performed at a higher power level 245 and later at the first power level 250 respectively.
  • the transition phase starts once a signal is generated to change the power level of the heat source.
  • This can be initiated by an operator or a cook changing the power to be supplied to a e.g. heating zone by means of an input provided for that purpose at a e.g. kitchen hob.
  • a break 260 is taking place in order to allow the thermal system including the heat source and e.g. the other heated masses like food and oven cavity to cool down and to make use of the energy saved in the thermal system including the heat source and e.g. the other heated masses like food and oven cavity due to its heat inertia.
  • a sequence of pulses 280, 288 and 290 follow that are separated by corresponding valleys 265, 270 and 275.
  • the small sub-phases as they may also be called 280, 288 and 290 have an ascending power phase represented by the width of the respective pulses 280, 288 and 290.
  • the ascending power phase can be achieved by a dynamic duty cycle management of the main power.
  • the pulses are e.g. evenly spread as also shown in Fig. 1 having a width 235 of a peak and a valley 40.
  • a temperature overshoot is limited respectively suppressed, and thermal losses to the environment are lowered.
  • power consumption is lowered as well.
  • the power control in the transition phase can be adapted to the requirements of an optimum curve shape of the temperature curve, decisions can also be taken how complex an algorithm of power control should be and the trade-offs between the desire to have an optimum curve shape and a less complex algorithm can be taken into account in designing the power control.
  • a user experience of a kitchen hob with a power control according to the present invention is better, as a user does not have to switch the power level manually, once e.g. the boiling temperature is reached.
  • Fig. 3 shows an apparatus or kitchen hob according to an embodiment of the present invention.
  • the kitchen hob 300 in this example has four cooking zones 310 to 325 and an oven 330.
  • the skilled person is aware that individual components of the hob shown in this embodiment like cooking zones 310 to 325 and oven 330 can be provided separately and also controlled individually in further developments of kitchen appliances according to the market demand without limiting the invention.
  • control board 335 with switches 340 and a display 337. It also has a controller 345 to control the power of each of the heating zones that are preferably present in the form of radiant heaters individually, and it also has a reader for a computer storage medium, e.g. a smartcard reader or an optical drive. From there read in data or instructions can be forwarded and stored into an internal non volatile memory to be used in the open loop control for heating of a thermal system including the heat source and e.g. the other heated masses like food and oven cavity or heating zone.
  • a computer storage medium e.g. a smartcard reader or an optical drive. From there read in data or instructions can be forwarded and stored into an internal non volatile memory to be used in the open loop control for heating of a thermal system including the heat source and e.g. the other heated masses like food and oven cavity or heating zone.
  • Fig. 3 shows a corresponding computer program product 370 which is present in the form of e.g. a smartcard, and has on it instructions 375 and 380 stored to operate the power control of the kitchen hob respectively its individual components like e.g. cooking zones 310 to 325 and an oven 330 according to the present invention.
  • This computer storage medium can be inserted into a slot of the reader 350 and can be read by the controller 345 of a kitchen hob in order to perform adequate power control of the heating zones of the kitchen hob in the manner as described above when explaining the method of the present invention and its embodiments.
  • a kitchen hob according to the present invention saves power and provides a better cooking experience to a customer as it avoids overshooting and thus long cooking or boiling periods which may lead to the spilling of fluids or other cooking substances.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
EP13198275.3A 2013-12-19 2013-12-19 Procédé, appareil et produit de programme informatique pour commander une source de chaleur associée à de l'inertie thermique Withdrawn EP2887763A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13198275.3A EP2887763A1 (fr) 2013-12-19 2013-12-19 Procédé, appareil et produit de programme informatique pour commander une source de chaleur associée à de l'inertie thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13198275.3A EP2887763A1 (fr) 2013-12-19 2013-12-19 Procédé, appareil et produit de programme informatique pour commander une source de chaleur associée à de l'inertie thermique

Publications (1)

Publication Number Publication Date
EP2887763A1 true EP2887763A1 (fr) 2015-06-24

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EP13198275.3A Withdrawn EP2887763A1 (fr) 2013-12-19 2013-12-19 Procédé, appareil et produit de programme informatique pour commander une source de chaleur associée à de l'inertie thermique

Country Status (1)

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EP (1) EP2887763A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3804585A1 (fr) 2019-10-10 2021-04-14 Electrolux Appliances Aktiebolag Procédé de fonctionnement d'un four de cuisson

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0442139A2 (fr) 1990-02-14 1991-08-21 Gaggenau-Werke Haus- und Lufttechnik GmbH Procédé et dispositif de commande de la puissance d'au moins un consommateur
WO1999011978A2 (fr) * 1997-09-04 1999-03-11 Technology Licensing Corporation Systeme diagnostique de surveillance de profils de cuisson
WO2008117910A1 (fr) * 2007-03-28 2008-10-02 Lg Electronics Inc. Procédés de régulation d'un appareil de cuisson par induction
EP2574143A2 (fr) * 2011-09-26 2013-03-27 E.G.O. ELEKTRO-GERÄTEBAU GmbH Procédé de chauffage d'un liquide contenu dans un récipient de cuisson et dispositif de chauffage à induction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0442139A2 (fr) 1990-02-14 1991-08-21 Gaggenau-Werke Haus- und Lufttechnik GmbH Procédé et dispositif de commande de la puissance d'au moins un consommateur
WO1999011978A2 (fr) * 1997-09-04 1999-03-11 Technology Licensing Corporation Systeme diagnostique de surveillance de profils de cuisson
WO2008117910A1 (fr) * 2007-03-28 2008-10-02 Lg Electronics Inc. Procédés de régulation d'un appareil de cuisson par induction
EP2574143A2 (fr) * 2011-09-26 2013-03-27 E.G.O. ELEKTRO-GERÄTEBAU GmbH Procédé de chauffage d'un liquide contenu dans un récipient de cuisson et dispositif de chauffage à induction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3804585A1 (fr) 2019-10-10 2021-04-14 Electrolux Appliances Aktiebolag Procédé de fonctionnement d'un four de cuisson
WO2021069248A1 (fr) 2019-10-10 2021-04-15 Electrolux Appliances Aktiebolag Procédé de fonctionnement d'un four de cuisson

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